EUVD-2026-72729
GHSA-6hfr-j2g6-38r3
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-accessible unauthenticated bypass with high confidentiality loss only; no integrity or availability impact confirmed.
Primary rating from Vendor (Commvault).
CVSS VectorVendor: Commvault
Lifecycle Timeline
2DescriptionCVE.org
CommServe contained an authentication bypass issue affecting access authorization and information disclosure. Software customers upgrade to resolved maintenance release. Update CommServe.
AnalysisAI
Unauthenticated remote access to Commvault Cloud's CommServe management server allows an attacker to bypass access authorization controls and disclose sensitive information. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H) confirms fully network-exposed, zero-prerequisite exploitation against the CommServe component across four active version branches (11.36.x, 11.40.x, 11.44.x, 11.46.x). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No special conditions - remote unauthenticated exploitation against network-accessible CommServe instances running Commvault Cloud within the affected version ranges. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 8.7 with a vector of AV:N/AC:L/AT:N/PR:N/UI:N reflects a maximally permissive network-exploitable condition: no authentication, no complexity barrier, no user interaction, no special attack requirements. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Commvault's advisory CV_2026_08_5 directs software customers to upgrade CommServe to the resolved maintenance release. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Commvault CommServe deployments and confirm which affected versions (11.36.x, 11.40.x, 11.44.x, 11.46.x) are in use; review access logs for suspicious activity. …
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External POC / Exploit Code
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